Research on the Construction Technology of Highway Low Gas Tunnel through Thin Coal Seam
In highway engineering,the geological conditions of thin coal seams are complex,and most of them contain gas,which brings many difficulties to actual construction.In this regard,the article proposes a study on the construction technology of highway low gas tunnels crossing thin coal seams:firstly,geophysical exploration and advanced drilling are used to survey coal seam gas;Secondly,lining construction should be carried out for tunnels crossing thin coal seams to ensure stability and safety.Coal mining and outburst prevention construction should be carried out to understand the distribution of coal seams and avoid risks;Finally,tunnel excavation construction will be carried out on the coal seam section.Based on the engineering overview,the construction process was determined in the article,and gas monitoring was carried out in the gas work area inside the tunnel.The monitoring results showed that the average gas concentration at the selected 1-6 gas work area detection points within 24 hours was lower than 0.3%,and the average gas emission was lower than 0.5 m3/min.This indicates that the construction of the project did not cause an increase in gas concentration inside the tunnel,and the construction effect is good.
Low gas tunnelThin coal seam constructionTunnel constructionConstruction method
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